Java it is very hard to remain Pure in an FP sense as the language is inherently missing features that would allow for all the convinient abstractions. New comments cannot be posted and votes cannot be cast, More posts from the learnjavascript community. (There's a wikipedia article if you're interested in more details).

So for my personal preferences, I use object oriented pattern with avoiding mutations, and composing small functions wherever possible.

The data structure passed in may is not affected by the "pipeline". FP languages do not have state (basically, data is sent to a function, and a resulting value is produced). So, if you want something to change, you pass in a reference to some data structure to a function, and a new reference is created if the data structure is "changed". In programming, there are two specific ways to transform an input.

The only caveat [and the same thing happens with OOP] is that if you don't organize your code structure well, then longterm you end up with spaghetti code [although i firmly believe that is the fate of all programs longterm anyway], generally this is the point at which i mention that the books and college classes do not agree with this, but get 65 people demanding evidence and get downvoted to oblivion. Seems pretty constraint. OOP has some great benefits, especially when considering recursive functions, and how the properties of a class can hold on to values as the function is recursing.

i.e. No classes. Functional evaluates inputs and yields outputs. You must know both to be an expert. If you look at other programming languages like e.g. No matter the inputs, you get the proper output. However none of of these common traits that you'll see when looking at FP/OOP languages are mutually exclusive. e.g. Everything in FP languages are immutable.

The 'old' way of having both logic and state in objects is rather outdated even in the OO world. Press question mark to learn the rest of the keyboard shortcuts, https://virtuslab.com/blog/oop-vs-fp-pursuit-extensibility-part-1/. OOP allows for many patterns, such as singletons, factories, observers, etc. I wouldn't say they work very well together. It doesn't appear in any feeds, and anyone with a direct link to it will see a message like this one. you will want to store that information in a class to keep it together. I find I use both with JavaScript, esp on the frontend. Now for this to be true, all involved functions must maintain 3 important properties: A) Determinism: If you call a function with the same parameters multiple time, the outcome must be the same. Well it gives you a very reasoned approach to compose programs. Functional programming is the programming technique that accentuates the functional factors required for creating and implementing the programs. No matter the inputs, you get the proper output.

Pure functions do not change the state or produce side effects, you will find that you can write a lot of your data processing as pure functions. If you know, say, Java, you know strings are immutable.

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